Academic staff of the University of Giessen

Wilhelm Conrad Röntgen (; German pronunciation: [ˈvɪlhɛlm ˈʁœntɡən] ; 27 March 1845 – 10 February 1923) was a German mechanical engineer and physicist, who, on 8 November 1895, produced and detected electromagnetic radiation in a wavelength range known as X-rays or Röntgen rays, an achievement that earned him the inaugural Nobel Prize in Physics in 1901. In honour of Röntgen's accomplishments, in 2004 the International Union of Pure and Applied Chemistry (IUPAC) named element 111, roentgenium, a radioactive element with multiple unstable isotopes, after him. The unit of measurement roentgen was also named after him.

Ferdinand Karl Franz Schaum (14 July 1870, Frankfurt am Main – 30 January 1947, Gießen) was a German chemist who specialized in the field of photochemistry.
He studied mathematics and sciences at the Universities of Basel, Berlin, Leipzig and Marburg, earning his doctorate at the latter institution in 1893. Afterwards, he served as an assistant to Theodor Zincke at Marburg and to Wilhelm Ostwald in Leipzig. In 1897 he obtained his habilitation at Marburg with a thesis on types of isometry.In 1904 he became an associate professor of physical chemistry at the University of Marburg, where he was an important influence towards the career of chemist Max Volmer. In 1908 he relocated to the University of Leipzig as an associate professor of photochemistry and scientific photography. From 1914 to 1935 he worked as a full professor of physical chemistry at the University of Giessen.Schaum was a member of the Gesellschaft zur Beförderung der gesamten Naturwissenschaften Marburg.

Karl Koester (born 2 April 1843 in Bad Dürkheim, died 2 December 1904 in Bonn) was a German pathologist and rector of the University of Bonn from 1898 to 1899. He was professor of pathology and director of the Institute of Pathology at the University of Bonn from 1874 to 1904. He held the title Geheimer Medizinalrat.
Koester studied medicine in Munich, Tübingen and Würzburg, and obtained his doctoral degree in Würzburg in 1867. His doctoral advisor and mentor was Friedrich Daniel von Recklinghausen, and he subsequently worked as Recklinghausen's assistant. From 1873 to 1874 he was professor of general medical pathology and anatomical pathology at the University of Giessen. He succeeded Eduard von Rindfleisch as professor of pathology at the University of Bonn in 1874.
In 1868 he published Ueber die feinere Structur der menschlichen Nabelschnur ("On the finer structure of the human umbilical cord").He became a member of the German National Academy of Sciences Leopoldina in 1880.

Richard Laqueur (27 March 1881 – 25 November 1959) was a German historian and philologist born in Strassburg.
He studied classical literature and history at the Universities of Bonn and Strassburg, and in 1904 received his doctorate of philosophy. In 1912 he was made a full professor at Strassburg, and during the same year was appointed professor at the University of Giessen. From 1914 to 1918 he performed military duties during World War I, and in 1919 returned to Giessen, where he remained until 1930. Laqueur was rector at the university in 1922/23.In 1930 he became a professor at the University of Tübingen, and two years later a professor at the University of Halle. Because he was Jewish, Laqueur was removed from his position at Halle in 1936, and in 1939 emigrated to the United States. After World War II, he returned to Germany, but was denied his former status at Halle due to bureaucratic obstacles. In 1952 he moved to Hamburg, where he was later granted an honorary professorship.Laqueur was a specialist of ancient Greek and Roman history, and was particularly interested in the economic history of their civilizations. He conducted extensive research of the ancient historians Polybius and Flavius Josephus, and made literary contributions to the Pauly-Wissowa- Realencyclopädie der Classischen Altertumswissenschaft.

Theodor Langhans (28 September 1839 – 22 October 1915) was a German pathologist who was a native of Usingen, Duchy of Nassau.
He studied medicine at the University of Heidelberg, and at the University of Göttingen under Friedrich Gustav Jakob Henle (1809–1885), at Berlin under Rudolf Virchow (1821–1902) and in Würzburg, where he became an assistant to Friedrich Daniel von Recklinghausen (1833–1910). In 1867 he became a lecturer at the University of Marburg, and in 1872 became a full professor of pathology at the University of Giessen, where he succeeded Ludwig Franz Alexander Winther (1812–1871).
From 1872 until 1912, Langhans was a professor of pathological anatomy at the University of Bern, where one of his assistants was surgeon Fritz de Quervain (1868–1940). He also worked with Serafina Schachova on kidney anatomy research using a canine model of induced nephritis.Langhans is remembered for his discovery of multi-nucleated giant cells that are found in granulomatous conditions, and are now referred to as Langhans giant cells.